DE60217314T2 - Wrapping machine with auxiliary cylinders and associated winding method - Google Patents

Description

technical area

The The invention relates to a peripheral wrapping machine, in particular of the so-called start-stop type, d. H. when the supply of a weaving fabric is interrupted or delayed to the full roll to replace with a new winding spindle. In particular, it concerns the invention comprises a wrapping machine comprising: a first and a second lower winding roller, which is a winding frame for a tissue material roll to be formed define; a third upper roller whose axis is movable over the first and second lower winding rollers, which the winding frame form, is arranged and carried by two mobile carriages, a growing one Dimension of the formed rollers formed in the winding frame to be possible.

The The invention also relates to a peripheral winding method for tissue rolls.

State of technology

Operations concerning the Winding or wrapping of fabric is in the field of nonwoven processing for example, in the production of rolls of semi-finished materials for the Production of sanitary napkins, diapers and the like and also at the production of paper, for example for the production of toilet paper, Kitchen Paper or similar, for producing rolls for feeding folding machines for the production of napkins, paper towels and the like Disposable products required.

Of the Tissue manufacturing process is ongoing and the tissue is on Exit rollers with large Diameter wound. These rolls are later unwound and the fabric is rewound on rolls with smaller diameters or rolls. For some Applications, the fabric is continuous and longitudinal cut and wound on hubs made of cardboard, plastic or other suitable material, wherein the cores are fixed in alignment on a winding spindle. The The winding spindle can be pulled out, for example pneumatically or on any other equivalent Way to get the hubs on it to the required To attach positions. Different tubular cores - identical or different axial lengths can take - take corresponding tissue strips, which by slitting the tissue of of the starting roller.

The Rollers or rollers are formed successively. When a Role is full, it is unloaded from the winding rack, for example, by two winding rollers, which are arranged side by side, is formed, and are replaced by a new winding spindle, on which the Hubs were previously attached.

A Wrapping machine of this type is described in EP-A-0747308. Another example of a wrapping machine of this type is in EP-A-1070675. Additional examples of peripheral Wrapping machine of start-stop type, d. H. at the time of loading temporary with tissue is interrupted to the full roll by another winding spindle in GB-A-2268476, DE-C-3836367, EP-A-0640544 described.

These Umwickelmaschinen need to be able to roll or roll whose diameter can be large with considerably winding up high winding speeds. Typically will the tissue is delivered at speeds exceeding 1000 meters per minute, which also in the order of magnitude of 2000 meters per minute.

The Control of the roll can be very difficult at such speeds be. The difficulties are particularly due to the fact that the winding spindles, formed on the cores of the fabric rolls be, have a high weight and tend to be through the effect to turn down their own weight. Other reported problems refer to the eccentricity of the hubs and the used Winding spindle. Both the eccentricity and the deflection generate strong vibrations at high winding speeds, what kind of This machine is typical. While of the winding, the rollers have the tendency to work in a horizontal Direction to vibrate perpendicular to their own axis. These Vibrations get higher be when softer material is wound up. The vibrations are more relevant when multiple rollers or rollers next to each other a single spindle can be formed. Furthermore, the critical Rotational speed of the assembly formed from spindle and To be formed role relatively low and can be due to the obvious dynamic problems are not exceeded become. The control of the role may be due to these vibrations an insufficient one guide and an insufficient Hold the trainee role, which is also very large diameter in the order from 1-2 Meters can be very difficult.

A Wrapping machine and a method according to the preamble of claims 1 and 16 is known from US-A-4,180,216.

Tasks and Summary of the invention

task The invention is a peripheral wrapping machine, in particular from the start-stop type, to create a more accurate control of the developing role by reducing vibration creates and resulting in increases the production speed allows. Another task of Invention is a winding method that provides a more precise control of Provides winding conditions.

These Tasks are characterized by the features of claim 1 and 16, respectively solved.

According to the invention In essence, a rewinder is provided with: a first and a second lower winding roller, which is a winding frame for one Roll of tissue forms: a third upper roller with a mobile Axis that over the first and second lower winding rollers is arranged and through Two moving sledges are carried to a growing size Allow dimension of the formed role in the winding frame. Characteristically, the two carriages carry two cylinders, whose axes are parallel to the axis of the third upper roller, those with a mutual approaching and removing movement, either to approach at or remove from the roll to be formed in the frame are provided. The two cylinders, which are arranged next to the third winding roller are, form a "enveloping" winding frame with the three winding rollers for the roll or bale of material to be formed. This arrangement controls consequently the vibrations to a more effective and reliable Wise.

in the Essentially, the formed role can at least during one Part of the winding cycle at five Points through an equal number of cylinders or rollers are kept in contact. The lower rollers are motor-driven, while the third upper roller and the two cylinders parallel to the latter can be driven either or idle. The first solution is preferable because the role can be rotated more efficiently.

The two cylinders are advantageously and preferably symmetrical to a vertical plane, which is the axis of the third upper roller contains, arranged, regardless of the other arrangements which are possible in principle. The approach and Removal movement of the cylinder with respect to the role to be formed can be a translation movement. For example, the Cylinder for this purpose attached to mobile slides or carriages be. Preferably, however, the cylinders are rotatable on an axis stored, which is parallel to the axis of the third winding roller. Each of the two cylinders can be mounted on a corresponding axis of rotation be. The two cylinders can however, preferably be mounted on the same axis, preferably with the rotation axis of the third roller above the frame, which passes through the two ers th winding rollers is formed, matches. This arrangement simplifies the transmission of motion on the two cylinders.

In a practical embodiment the two cylinders are each supported by a pair of pivot flanks, which are attached to the two carriages, which are the third upper Wear winding roller.

in the Principle can the two cylinders during the Aufwickelzyklus rest on the roll to be formed and only open at the end of winding. According to one preferred embodiment However, the invention provides at least one actuating element, about the movement of these two cylinders with respect to the slides and to a central control unit for controlling the movement during Forming the role, based on at least one control parameter, to control. The movement is controlled according to a signal that comes from the burden, with which the roller to be formed acts on the cylinders. For example can Load cells may be provided, which determine the load, which by the role is exerted on the two cylinders and, accordingly, the opening movement the two cylinders are controlled.

Of the Diameter of the roll to be formed can also be determined and the position of the two cylinders may further be according to this Diameter controlled. For this purpose, for example the position of the third roller and the position of the roller axis determined using an encoder or other position transmitter become. The roller axis can be matched by detecting the position of the Centers (in a known manner), with the axis of forming role to be detected. The diameter The formed roll or roll is based on these two dates determined and the position of the cylinder with respect to the third roller is controlled on the basis of this diameter. The cylinders will be open, when the diameter of the roll grows. The force exerted by the roller on the cylinders becomes more control measured, for example by means of load cells. An additional opening or closing of the two Cylinder can be controlled when the load is outside a predetermined range.

The invention also relates to a method of forming fabric rolls according to claim 16. The method has the following phases: inserting a winding spindle into a winding frame, formed by a first and a second lower winding roller; Winding a length of fabric onto the winding spindle, causing the winding spindle to rotate in the frame; Unloading the formed roll; wherein during at least part of the winding phase, the roller is in contact with a third mobile roller disposed over the first and second lower winding rollers; the third roller being gradually removed from the first and second lower winding rollers to account for the increase in the diameter of the roller. According to the invention, the method is characterized in that the roller is brought into contact with a pair of cylinders arranged adjacent to the third mobile cylinder for at least part of the winding phase, the pair of cylinders being mobile with respect to the third roller, to follow the increasing diameter of the roll.

This Procedure provides better control of the role during the Training the same safe, especially during the middle part of the winding cycle.

advantageously, The cylinders are gradually pivoted to the growing To follow the diameter of the roll, preferably with a pivoting movement about a common axis.

additional advantageous properties and embodiments of the method and the machine according to the invention are set forth in the appended claims.

Short description the drawings

The The invention will be apparent from the following description and incorporated by reference Drawings illustrating a non-limiting practical embodiment of the Invention show better understandable. In the drawings, identical reference numerals are identical or designate corresponding parts, shows:

1 an overall view of the machine according to a vertical plane which is perpendicular to the axis of the winding rollers;

2 a view in section along a plane which is parallel to the axis of the winding rollers to show the assembly, which are formed by the third roller and the two cylinders which are arranged side by side, with their respective transmissions;

3 an enlarged detail view 1 , and

4A - 4E five consecutive phases winding cycle of a roll or roller.

detailed Description of the preferred embodiment of the invention

The accompanying figures show the salient parts of the wrapping machine except the components, assemblies and elements that are in themselves are known and for the understanding of the invention are not relevant. In particular, the devices are for inserting the winding spindle, the unloading of the finished roll and not shown for cutting the fabric at the end of the winding cycle. The matching spindle control axes that can be used, and the for the person skilled in the art are also not shown.

In This description is based on the development of a role on the Winding spindle reference. In fact, the role can be through a number of individual rolls may be formed side by side are arranged and at the same time receive the same tissue length, since the winding cycle by winding fabric strips through slitting of a single input tissue, on tubular cores, axially aligned with the spindle. As a result, the term "role" can be used generally a single roller or a number of axially aligned rollers, which are formed at the same time.

The rewinder is generally indicated by the reference numeral 1 denotes two side surfaces 3A and 3B , which carry a first and a second lower winding roller, with the reference numerals 5 and 6 are designated which axes of rotation 5A and 7A have, which are each parallel to each other and which is a winding frame 8th form, on which a winding spindle is arranged to form the fabric rolls. The rollers 5 and 7 are driven by a motor (not shown).

Along the side surfaces 3A and 3B are vertical guides 9 arranged on each of which sledges 11 slide. The two sleds 11 wear on camps 12 a third upper roller 13 with an axis 13A parallel to and above the lower winding rollers 5 and 7 is arranged.

The two sleds 11 are by a crossbeam 15 that is parallel to the roller 13 is reciprocally connected for the purposes described below.

Two side surfaces 17 and 19 swing on each of the two sleds 11 around the same axis 13A the roller 13 , The two side surfaces 17 wear a first cylinder 21 with an axis 21A parallel to the roller 13 in camps 23 , The two side flats chen 19 wear a second cylinder 27 with an axis 27A , and in turn parallel to the upper roller 13 is in camps 25 ,

The two pairs of side surfaces 17 and 19 turn around the axis 13A and are provided with a synchronized and opposite pivoting movement to the cylinders 21 and 27 to open and close, so that they are attached to a vertical plane, which is the axis 13A contains, approaches or moves away from it.

A corresponding slider 31 slides on a guide 33 that is integral with the sled 11 on each of the sledges 11 is provided to the pivotal movement of the side surfaces 17 . 19 the respective cylinders supported by the side surfaces 21 and 27 to control. The movement of the slider 31 in the direction of the double arrow f31 on the sled 11 is by a threaded spindle 35 controlled with a nut 37 engaged, which integral with the slider 31 is trained. The rotational movement of the two threaded spindles 35 is powered by a single engine 39 controlled by a post 41 worn in one piece with the, the two sleds 11 connecting beams 15 is trained. The movement of the engine 39 is through a transmission 43 on two cardan shafts or equivalent means 45 and from there to the two supports 47 which the two sleds 11 are assigned, transferred. As a result, the rotation of the engine controls 39 the movement of the slide 31 in the direction of the double arrow f31 synchronously on the two carriages via the kinematic chain of the mechanism 45 . 47 . 35 ,

at 52 and 54 are at each of the slides 31 two tie rods 51 and 53 hinged, whose opposite ends at the points 56 and 58 to the side surfaces 17 and 19 are articulated. The joints 56 and 58 lie on the sides of the vertical plane, which is the axis 13A so that the upward and downward movement in the direction of the double arrow f31 of the two slides 31 the pivoting movement of the side surfaces 17 . 19 around the axis 13A and consequently the cylinder 21 and 27 caused.

At the crossbeam 15 is an engine 61 held over a pulley 63 a movement on a belt 65 which transmits an extra pulley 67 turns on the axis of the roller 13 is attached. The motor 61 thus transfers the rotational movement to the third upper roller 13 , A second pulley 69 to which two straps 71 and 73 is on the axis of the third upper roller at the opposite end relative to the position of the pulley 67 , attached.

The two belts rotate on respective pulleys 75 and 77 on the axes of the cylinders 21 respectively. 27 are attached. The belts 71 and 73 are also on corresponding guide pulleys 79 and 81 turned off by the side surfaces 17 and 19 being held. In this arrangement, the engine rotates 61 the cylinders 21 and 27 in addition to the roller 13 ,

The vertical movement according to the double arrow f11 of the two carriages 11 on the guides 9 is through a pair of cylinder-piston actuators 12 controlled by means of brackets 14 on the main side surfaces 3A . 3B the machine are attached, and their rods to the crossbar 15 attached, which are the two carriages 11 combines.

The operation of the wrapping machine described above is clearly by the sequence of 4A to 4E shown.

4A shows the initial winding phase of the fabric N on the roll R. During this phase, the diameter of the roll is small and the role is consistent with the lower winding rolls 5 and 7 and the upper winding roller 13 in touch. These three rollers are driven and rotate at the same peripheral speed to rotate the roll to be formed. The roll is formed on a reel spool M on which tubular cores (consisting of cardboard, plastic or other material) remaining inside the roll have been previously set and fastened. As stated above, the roller may consist of a number of rollers wound side by side at the same time on tubular cores axially aligned and mounted on the reel M.

During the initial winding phase, the two auxiliary cylinders 21 and 27 in a raised position and through the corresponding side surfaces 17 and 19 held. It will generate sufficient space around the cylinders 21 and 27 to bring into contact with the surface of the roll to be formed, as the diameter of the roll to be formed is larger, as in the 4B is shown. The side surfaces 17 and 19 are pivoted down to the auxiliary cylinder 21 and 27 to bring into contact with the surface of the roll R to be formed. The sledges 11 are progressing with the increase in the diameter of the roll, as is apparent from the 4B and 4C and in the 4D and 4E (which shows the full roll) is seen moving up to the roller 13 from the rollers 5 and 7 to remove. At the same time the auxiliary cylinders 21 and 27 by a pivoting movement in opposite directions of the side surfaces 17 and 19 separated from each other. Once the roller R has reached the final diameter, it will unload them from the winding frame, in a known manner by the winding rollers 5 and 7 is formed, with the exception of the additional opening movement of the auxiliary cylinder 21 and 27 , which are additionally raised to avoid a collision when unloading the roll.

The gradual lifting movement of the sledges 11 and consequently the roller 13 is controlled in a manner commonly used in such machines. The gradual opening movement of the flanks 17 . 19 - With the consequent removal of the auxiliary cylinder 21 and 27 from the vertical plane, which is the axis 13A the roller 13 contains, for adaptation to the increasing diameter of the roll R, can advantageously by means of a load sensor, such as a load cell, of one or both carriages 11 is worn, controlled. The load cell is indicated by the reference numeral 91 and is between a top plate 93 of the sled 11 and an angular transmission 47 ; the movement on the threaded spindle 35 transfers, arranged. According to this arrangement, the load cell detects 91 a reaction force between the carriage 11 (especially the top plate 93 of the slide) and the slider 31 gliding on the sledge. The reaction forces passing over the tie rods 51 are transferred (which under certain conditions may be struts when the pushing force exerted by the developing roller exceeds the weight) are transferred to the slider 31 relieved.

The reaction force between the roller and the cylinders 21 . 27 increases with increasing diameter of the roller R in a certain angular position of the side surfaces 17 . 19 and consequently the cylinder 21 and 27 , This reaction force is via the tie rods 51 . 53 on the slide 31 is transmitted and thus through the load cell 91 measured. The signal generated by the load cell is controlled by a control unit (schematically represented by the reference numeral 95 displayed) used to the engine 39 to control and the cylinders 21 and 27 to open.

As in the 4A - 4E As shown, the roll R to be formed becomes additional to the winding rolls 5 . 7 and 13 during most of the winding cycle through the auxiliary cylinders 21 and 27 kept pace. This provides better control of the roll, and also allows the use of winding speeds faster than those traditionally achieved with rewinding machines of this type.

In the initial phase of the winding cycle, the cylinders can 21 and 27 due to lack of space not be in contact with the roll to be formed, but in this case the roll is through the winding rolls 5 . 7 and 13 sufficiently guided and controlled. At the end of the winding cycle, the cylinders can 21 and 27 be removed from the roll in advance with respect to the unloading process, by lifting the winding roller 13 is continued. In this way, the presence of the cylinders slows down 21 and 27 not the role unloading process and the process of replacing the finished roll with a new winding spindle.

It should be noted is that the drawing serves only as a practical example and that many changes in the construction and the embodiments of the invention carried out can be without departing from the scope of the present claims. In the the appended claims existing Reference numbers are for the purpose of facilitating understanding only the claims with reference to the description and the drawing and do not serve for limiting the scope of protection represented by the claims is.

Claims (22)

Wrapping machine comprising: a first and a second lower winding roller ( 5 . 7 ) defining a winding frame for a roll (R) of fabric (N); a third upper roller ( 13 ) with a mobile axis ( 13 ), which is arranged above the first and second lower winding rollers and by two movable carriages ( 11 ) to allow an increased dimension of the formed roll in the winding frame; the two carriages ( 11 ) two cylinders ( 21 . 27 ) whose axes are parallel to the axis ( 13A ) of the third upper roller ( 13 ), and which are provided with reciprocal, approaching and removing movement, either for approaching or removing from the roll to be formed in the frame; and at least one actuator is provided to control the movement of the two cylinders with respect to the carriages; characterized in that a central unit controls the movement as the diameter of the roll to be formed increases, in accordance with a signal proportional to the reaction force between the cylinders and the roll to be formed. Wrapping machine according to claim 1, characterized in that it has sensors for detecting the force on the cylinders. Wrapping machine according to claim 1 or 2, characterized in that the two cylinders ( 21 . 27 ) to a vertical plane representing the axis ( 13A ) of the third upper roller ( 13 ) are arranged symmetrically. Wrapping machine after one or more ren of the preceding claims, characterized in that the two cylinders ( 21 . 27 ) are provided with a Schwingbewe movement to approach the roll to be formed and to remove from this. Wrapping machine according to claim 4, characterized in that that the two cylinders pivot about a common axis. Wrapping machine according to claim 5, characterized in that the common pivot axis of the two cylinders with the axis of the third upper roller ( 13 ) matches. Rewinding machine according to one or more of the preceding claims, characterized in that the two cylinders are each supported by a pair of pivoting flanks connected to the two carriages ( 11 ) are connected. Wrapping machine according to one or more of the preceding claims, characterized in that each slide has a slide ( 31 ), which slides on the corresponding carriage, and that the two cylinders are attached to the two sliders, the movement of which causes the cylinders to pivot. Wrapping machine according to claim 8, characterized in that the position indicators are mounted above the axis of the third mobile roller ( 13 ) are. Wrapping machine according to claim 8 or 9, characterized characterized in that a single actuator movement the two slides associated with the two slides controls. Wrapping machine according to claim 10, characterized in that the actuating element by a transverse bar ( 15 ), which connects the two carriages, whereby a transmission ( 43 . 45 . 47 . 35 ) is provided to transmit the movement of the two carriages. Wrapping machine according to one or more of the preceding Claims, characterized in that the third upper roller and the two cylinders are motor-driven. Wrapping machine according to claim 12, characterized in that a single motor ( 61 ) is provided to drive the third roller and the two cylinders. Wrapping machine according to claim 11 and 13, characterized in that the individual drive by the crossbar ( 15 ), which connects the two carriages together. Wrapping machine according to one or more of the preceding claims, characterized in that it comprises vertical guides ( 9 ) for the sledges ( 11 ) and actuators ( 12 ) which control the movement of the carriages on the guides. Method for forming fabric rolls comprising the following phases: inserting a winding spindle (M) into a winding frame, formed by a first and a second lower winding roll ( 5 . 7 ); - Winding a length of tissue on the winding spindle, thereby causing the winding spindle rotates in the frame; - unloading the formed roll; and wherein during at least part of the winding phase, the roll is provided with a third mobile roll ( 13 ) located above the first and second lower winding rollers; the third roller being gradually removed from the first and second lower winding rollers to account for the larger of the diameter of the roller, the roller being brought into contact with a pair of cylinders disposed on the side of the third mobile cylinder, wherein, for at least part of the winding phase, the pair of cylinders is mobile to follow the increasing diameter of the roll, characterized in that the movement of the two cylinders is controlled in accordance with the pressure exerted on the roll to be formed. Method according to claim 16, characterized in that that the two cylinders are gradually pivoted to the growing Diameter of the roll to follow. Method according to claim 20, characterized in that that the two cylinders pivot about a common axis. Method according to claim 17, characterized in that that the common pivot axis with the axis of the third upper Roller coincides. Method according to one or more of claims 16 to 19, characterized by: inserting the winding spindle into the frame; - Winding a first length of fabric on the winding spindle wherein the third roller is held with the roll to be formed for at least part of this winding phase in contact; Bringing the two cylinders closer to the forming roll and winding at least one additional fabric length; - Moving the two cylinders off the roller; - Unloading of the roll from the winding frame, on which wound a predetermined length of tissue is. Method according to claim 20, characterized in that that the cylinders open at the end of the winding cycle and from the finished Role be moved away and that raised the third roller along with the two cylinders is to move them from the role. Method according to one or more of claims 16 to 25, characterized in that the first, second and third Winding rollers and the two cylinders driven by a motor become.